The 'Seinfeld' cast recorded these awesome birthday wishes for a terminally ill fan

Wanting to give his terminally ill father an early birthday gift, Jim's son, James, decided to put together a video of birthday wishes. But besides asking friends and family to wish his father a happy birthday, James got a little more ambitious and decided to reach out to the cast of "Seinfeld."

They were more than happy to participate, and more than a dozen cast members such as Wayne Knight (Newman), Patrick Warburton (David Putty), and Larry Thomas (The Soup Nazi) sent Jim personalized birthday messages, which the younger Calder then compiled on his YouTube page.

Of the four main cast members, Julia Louis-Dreyfus (Elaine) and Michael Richards (Kramer) wished Calder a happy birthday. Richards even reached out with a personal phone call.

"I'm so thrilled and happy to hear how much you've enjoyed 'Seinfeld' along with your family; that's a great joy, so thank you for that," Louis-Dreyfus said in her video. "You have a wonderful son who clearly adores you, so, congratulations on that; you did that very well. And, third, I just wanted to say happy birthday. I hope it's a great one, and I'm wishing you the very best. Have fun."